👉 Stefan is a fictional character from the science fiction television series "Star Trek." He is portrayed by actor James Marsters. Stefan is known for his unique abilities and the ability to manipulate energy, which he uses in various situations such as saving people from dangerous situations or using it to create powerful weapons. He is a skilled mechanic and has been trained by Admiral Riker (played by Leonard Nimoy) at Starfleet Academy. He also has a keen eye for detail and his knowledge of physics